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Difficult seed profiles

These species were identified by participants at Kew's 'Difficult' Seeds Project workshops as showing poor germination during initial testing and/or during re-tests after storage. Low germination may be due to inherent issues such as seed storage behaviour, dormancy or seed longevity, or handling and storage difficulties.

To share information on 'difficult' seeds and send your images to improve our resource, email us at difficultseeds@kew.org.

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Why are the seeds of this species difficult? The seeds may have physiological dormancy, which can be overcome by mimicking the seasonal patterns of the species' native habitat.

Why are the seeds of this species difficult? The seeds are expected to have physical dormancy, which can be overcome by scarifying the seed coat to allow water uptake and encourage germination.

Send us an image of this species
Why are the seeds of this species difficult? The seeds have physical dormancy, which can be overcome by scarifying the seed coat or using a dry heat treatment.

Why are the seeds of this species difficult? The seeds may have physical dormancy, which can be overcome by scarifying the seed coat to allow water uptake and encourage germination.

Why are the seeds of this species difficult? Species of the Asteraceae family can produce a high proportion of empty seeds, which collectors and curators must take account of. The seeds may have physiological dormancy, which can be overcome by mimicking the seasonal patterns of the species' native habitat.
Send us an image of this species

Why are the seeds of this species difficult? This species has recalcitrant seeds, which have a high critical moisture content and will rapidly lose viability if they are dried.

Why are the seeds of this species difficult? The seeds may have physiological dormancy, which can be overcome by mimicking the seasonal patterns of the species' native habitat.
Theobroma cacao pods hanging on the tree

Why are the seeds of this species difficult? This species has recalcitrant seeds, which have a high critical moisture content and will rapidly lose viability if they are dried.

Why are the seeds of this species difficult? The seeds may have physiological dormancy, which can be overcome by mimicking the seasonal patterns of the species' native habitat.

Why are the seeds of this species difficult? This species has recalcitrant seeds, which have a high critical moisture content and will rapidly lose viability if they are dried.
Send us an image of this species

Why are the seeds of this species difficult? The seeds present no inherent problems in storage or germination. However, if they have not been properly dried and stored under optimal conditions, storage life and viability will be reduced.

Why are the seeds of this species difficult? Some sub-species may have seeds with physiological dormancy. Wild-growing sub-species may produce a high proportion of empty seeds, which collectors and curators must take account of.
Flowers and leaves of nettle

Why are the seeds of this species difficult? The seeds may have physiological dormancy, which can be overcome with a moist pre-chill treatment.

Why are the seeds of this species difficult? Species of the Asteraceae family can produce a high proportion of empty seeds, which collectors and curators must take account of. The seeds may have physiological dormancy, which can be overcome by mimicking the seasonal patterns of the species' native habitat.
Why are the seeds of this species difficult? Species of the Asteraceae family can produce a high proportion of empty seeds, which collectors and curators must take account of. The seeds may have physiological dormancy, which can be overcome by mimicking the seasonal patterns of the species' native habitat.
Why are the seeds of this species difficult? The seeds present no inherent problems in storage or germination. However, if they have not been properly dried and stored under optimal conditions, storage life and viability will be reduced.
Why are the seeds of this species difficult? The seeds present no inherent problems in storage or germination. However, if they have not been properly dried and stored under optimal conditions, storage life and viability will be reduced.
Why are the seeds of this species difficult? The seeds present no inherent problems in storage or germination. However, if they have not been properly dried and stored under optimal conditions, storage life and viability will be reduced.

Why are the seeds of this species difficult? This species has recalcitrant seeds, which have a high critical moisture content and will rapidly lose viability if they are dried.

Send us an image of this species

Why are the seeds of this species difficult? The seeds may have morphological or morphophysiological dormancy, which would have to be overcome before they will germinate.

Showing 141 - 160 of 163 results

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